We dropped the AFR to 3.2 The idle went up by 300 RPM over the 9% setup (with no idle adjustments).
With a small increase from 6% to 9% nitro, in preparation we dropped the AFR to from 3.7 to 3.4. As a result, we picked up a tenth of a second and about 4 MPH over 6% nitro.
Just a note about our test engine for this year. We put our blown alcohol engine back together for nitro testing this year.
Question: Different racers get different boost readings
In our drag racing, we did use air to fuel ratio as a controlled value to get the engine into a linear range. That task is an extensive explanation through out writings. The linear range is where the engine is completely predictable. We achieved that very well in our racing.
Congrats to Scott Williamson for great result reported as follows: “… I raced last weekend at the Jegs Cajun Sports Nationals
A blown nitro ford combo was reviewed that was run for a year with no breakage, no burned pistons, and no other problems associated with nitro. An extensive analysis tech info may follow if there is interest. Let us know.
Message: in your fuel injection book, you show a vacuum gauge with a telltale, do you know where to obtain one of these gauges? KS It is not a vacuum gage but a pressure gage. You probably want a 0-200 psi, liquid filled, tattle tale gage.
Question: Effect of lowering blower overdrive?? More or less power? Bob?s answer: A trend now is gearing the blower to the racetrack. That is done with rear end gearing, tire size, shift point, and blower overdrive. Adjustment of any of those will change the speed attained by the blower at the end of the drag […]
Question: Fuel injection adjustment with launch controls for a torque converter racecar Answer: When a mechanical fuel injection throttle is part open, such as in preparation for launching from the starting line using throttle control setups, the air to fuel ratio is dependent on that throttle position at the time just before the launch.